The Role of Nonmetastatic Lymph Nodes in the Survival of Colorectal Cancer: A Systematic Review oleh Alexander J. Pennings, MSc, Brecht A. van der Velden, BSc, Maximilian Kloft, MSc, Loes F. S. Kooreman, MSc, Jos M. P. Kleijnen, PhD, Stephanie O. Breukink, PhD, Geerard L. Beets, PhD, Heike I. Grabsch, PhD, Jarno Melenhorst, PhD